The facility (1) comprises an olfactometer (2) having an inlet (7) for an osmic vector which does not stimulate the trigeminal nerve, an inlet (8) for an osmic vector from a predefined family of odours, two nasal jets (9a, 9b), two supply circuits (11a, 11b) for supplying an osmic vector and valves (23a, 23b) osmic vector supply means (13, 14) an electroencephalograph (3) having an EEG helmet (15), processing and recording means (16) for signals received from the helmet (15), means (18) for viewing and printing the time curve of the electrical signals control means (19) of the electroencephalograph (3) and control means (12) of the olfactometer (2) being associated in such a way that the person is subject, in a first phase, to the osmic vector which does not stimulate the trigeminal nerve, and in a second phase, also to the osmic vector corresponding to the predefined family of odours the means (18) for viewing and printing are associated with the olfactometer (2) in order to view and print the actual CRsvo time curve of signals/osmic vectors a memory (21) having typical CTisvo theoretical time curves of the signals/osmic vectors, corresponding to the typical causes comparison means (22) for comparing the actual CRsvo time curve of the signals/osmic vectors and typical CTisvo theoretical time curves of the signals/osmic vectors, so as to identify which typical CTisvo theoretical time curves of the signals/osmic vectors are closest to the actual CRsvo time curve of the signals/osmic vectors.Linstallation (1) comprend un olfactomètre (2) ayant une entrée (7) pour un vecteur osmique ne stimulant pas le nerf trijumeau, une entrée (8) pour un vecteur osmique dune famille dodeur prédéfinie, deux gicleurs nasaux (9a, 9b), deux circuits dalimentation (11a, 11b) en vecteur osmique et des vannes (23a, 23b) des moyens (13, 14) dalimentation en vecteurs osmiques un électroencéphalographe (3) ayant un casque EEG (15), des moyens (16) de traitement et denregistrement des signaux
